Citrus > Cold Hardy Citrus

PT-plusXValentine cross

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kumin:
Ilya, what time duration do you subject the seedlings to -8C? Do you do any cold pre-exposure prior to the testing? Your procedure certainly could reduce time, space and materials expended on doomed seedlings. Thanks

Ilya11:
As an acclimatation step I  expose pots to outside conditions for two weeks during February and March. Usually average temperatures in this period  change from 8 to 12C. 
In temperature  controlled freezer the pots with seedlings are kept at 0C overnight, -4.5C for 3 hours and -8C for four hours. Then the are left with power off overnight. In 6 hours the soil temperature of pots  reaches 0C. 

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